In early March, an estimated 7,500 American combat troops will travel to Norway to join thousands of soldiers from other NATO countries in a massive mock battle with imagined invading forces from Russia. In this futuristic simulated engagement – it goes by the name of Exercise Cold Response 2020 – allied forces will "conduct multinational joint exercises with a high-intensity combat scenario in demanding winter conditions," or so claims the Norwegian military anyway. At first glance, this may look like any other NATO training exercise, but think again. There's nothing ordinary about Cold Response 2020. As a start, it's being staged above the Arctic Circle, far from any previous traditional NATO battlefield, and it raises to a new level the possibility of a great-power conflict that might end in a nuclear exchange and mutual annihilation. Welcome, in other words, to World War III's newest battlefield.